An integrated high-speed on-off valve for the pilot of a multi-way valve

Abstract

An integrated high-speed switching valve for the pilot of a multi-way valve, which comprises a plug cap, a valve body, an armature, a valve seat, a valve core, a bracket, a spring, a packaging insulator, a coil insulating skeleton and an adjusting part; the plug cap and the valve seat are respectively fixedly installed at both ends of the valve body, the valve seat has an oil inlet channel, a bracket, an armature and a packaging insulator are sequentially inserted into the valve body from the valve seat towards the plug cap, the coil insulating skeleton is installed in the inner cavity of the packaging insulator, the plug cap is inserted into the coil insulating skeleton and is arranged adjacent to the slidable armature, an inner channel is processed in the middle of the plug cap and is matched with the axially adjustable adjusting part, a spring is arranged in the inner channel, an oil control channel is opened on the side wall of the valve body between the valve seat and the bracket, an oil return channel is opened on the outer wall of the valve body between the bracket and the armature, and the valve core is an integrated structure composed of a spherical valve core and a connecting rod. The invention is simple and compact, has a fast response, and can realize the fast and accurate commutation of the valve core of the multi-way valve.

Description

Technical Field

[0001] The present invention belongs to the field of digital valves, and particularly relates to an integrated high-speed on-off valve for a multi-way valve pilot. Background Art

[0002] Traditional on-off valves are mainly normally closed two-way three-way high-speed on-off valves and normally open two-way three-way high-speed on-off valves. Both of them adopt a double-ball valve core structure, and the movement of the armature causes the push rod to push the valve core to move. This pushing operation mode impacts the valve core, reducing the service life of the valve and increasing the working noise.

[0003] With the development of automation, digital technology and communication technology, hydraulic valves are becoming more digital, integrated and intelligent. At present, almost all high-end multi-way valve products used in China are imported from abroad. Domestic companies mainly focus on imitation, and there is a certain gap in performance compared with foreign products. Among them, as a digital hydraulic valve, the high-speed on-off valve mainly uses a PWM (pulse width modulation) signal as the input signal and the flow output is discrete. As the pilot stage of the multi-way valve, the high-speed on-off valve directly controls the flow output of the main valve to reverse. This requires the high-speed on-off valve to have an extremely high response speed to achieve the precise displacement of the main valve and be able to withstand a high service life.

[0004] CN218582259U relates to a switch valve core, which overcomes the risk that the balanced valve core loosens and moves upward, resulting in the valve being opened. However, this valve core is a pure mechanical structure and has a low response speed.

[0005] CN113931886A relates to a low-energy consumption, high-pollution resistance, ultra-high-frequency response digital hydraulic servo control system and control method. The sealing sphere adopts a hollow structure and a wear-resistant coating technology, which overcomes the problems of large inertial force and narrow frequency response. However, the overall structure of this system is relatively complex and is not convenient for lightweight and fast commutation use. Summary of the Invention

[0006] The present invention aims to overcome the prior art and provides an integrated high-speed on-off valve for a multi-way valve pilot. This on-off valve has a simple and compact structure, fast response, and can achieve fast and precise commutation of the multi-way valve core.

[0007] An integrated high-speed on-off valve for a multi-way valve pilot includes a plug cap, a valve body, an armature, a valve seat, a valve core, a bracket, a spring, a packaged insulator, a coil insulating skeleton, and an adjusting member.

[0008] The valve body is a hollow body. The plug cap and the valve seat are fixedly installed at both ends of the valve body respectively. The valve seat has an oil inlet channel. A bracket, an armature and a packaged insulator are successively inserted into the valve body from the valve seat towards the plug cap. The coil insulation skeleton is installed in the inner cavity of the packaged insulator. The coil is wound around the coil insulation skeleton. The plug cap is inserted into the coil insulation skeleton and is arranged adjacent to the slidable armature. An inner channel is processed in the middle of the plug cap and is matched with an axially adjustable adjusting part. A spring is arranged in the inner channel. The two ends of the spring respectively abut against the armature and the adjusting part. An oil control channel is opened on the side wall of the valve body between the valve seat and the bracket, and an oil return channel is opened on the outer wall of the valve body between the bracket and the armature. Both the plug cap and the armature are made of soft magnetic materials; the valve body is made of stainless steel;

[0009] The spool is an integral structure composed of a spherical spool and a connecting rod. The connecting rod is slidably arranged in the middle of the bracket. The free end of the connecting rod is connected to the armature. The spherical spool is located at the oil control channel. Part of the spherical surface of the spherical spool is respectively matched with part of the spherical surfaces of the valve seat and the bracket to control the oil inlet and outlet.

[0010] Further, the armature has a connecting hole and a groove. The connecting hole is threadedly connected to the connecting rod of the valve rod. The bottom of the groove abuts against the end of the spring.

[0011] The beneficial effects of the present invention compared with the prior art are as follows:

[0012] 1. The high-speed switching valve in the present invention has excellent performance. It is small in size (it can be made 50 mm long and 27 mm wide), light in weight (0.26 kg), fast in response (2.6 ms without oil), and simple in structure. It can realize the fast and accurate commutation of the spool of the multi-way valve, which is beneficial to promoting the digitalization and intelligentization of hydraulic valve products.

[0013] 2. In a conventional high-speed switching valve, the movement of the armature causes the push rod to push the spool to move. In the high-speed switching valve of the present invention, the spool and the connecting rod are integrally processed, and the armature is connected to the spool through a threaded connection. The armature pulls in a way to distinguish from the way the armature pushes in a general valve, avoiding the action of the push rod hitting the spool, effectively improving the service life of the valve, and at the same time reducing the noise during operation.

[0014] 3. The spool is an integral structure of the spool and the connecting rod. Compared with other valves of the same type, the steel ball of the spool and the connecting rod are integrally processed, eliminating the threaded connection. The spool is processed with an external thread, which is convenient for connecting the armature.

[0015] The technical solution of the present invention will be further described below in conjunction with the drawings and embodiments: Description of the Drawings

[0016] Figure 1 It is an axonometric view of the integral high-speed switching valve of the present invention;

[0017] Figure 2The main sectional view of the integrated high-speed on-off valve of the present invention;

[0018] Figure 3 The half-sectional view of the valve body;

[0019] Figure 4 The half-sectional view of the valve core;

[0020] Figure 5 The half-sectional view of the plug cap;

[0021] Figure 6 is Figure 5 the left view of

[0022] Figure 7 The half-sectional view of the adjusting part;

[0023] Figure 8 The half-sectional view of the armature;

[0024] Figure 9 The structural schematic diagram of the spring;

[0025] Figure 10 The half-sectional view of the valve seat;

[0026] Figure 11 The half-sectional view of the bracket;

[0027] Figure 12 The axonometric drawing of the bracket;

[0028] Figure 13 The half-sectional view of the encapsulating insulator;

[0029] Figure 14 is Figure 13 the bottom view of the encapsulating insulator in

[0030] Figure 15 The half-sectional view of the coil insulation skeleton;

[0031] Figure 16 The closed state diagram of the integrated high-speed on-off valve of the present invention;

[0032] Figure 17 The open state diagram of the integrated high-speed on-off valve of the present invention. Detailed implementation manners

[0033] Hereinafter, embodiments of the technical solution of the present invention will be described in detail with reference to the drawings. Unless otherwise specified, the technical terms or scientific terms used in this application shall have the ordinary meanings understood by those skilled in the art to which the present invention belongs.

[0034] An integrated high-speed on-off valve for the pilot of a multi-way valve in this embodiment includes a plug cap 1, a valve body 2, an armature 4, a valve seat 8, a valve core 9, a bracket 10, a spring 11, a packaging insulator 13, a coil insulating skeleton 14, and an adjusting part 15;

[0035] The valve body 2 is a hollow body. The plug cap 1 and the valve seat 8 are respectively fixedly installed at both ends of the valve body 2. The valve seat 8 has an oil inlet channel. The bracket 10, the armature 4, and the packaging insulator 13 are sequentially inserted into the valve body 2 from the valve seat 8 towards the plug cap 1. The coil insulating skeleton 14 is installed in the inner cavity of the packaging insulator 13. The coil 12 is wound around the coil insulating skeleton 14. The plug cap 1 is inserted into the coil insulating skeleton 14 and is arranged adjacent to the slidable armature 4. An inner channel is processed in the middle of the plug cap 1 and is matched with the axially adjustable adjusting part 15. A spring 11 is arranged in the inner channel. The two ends of the spring 11 respectively abut against the armature 4 and the adjusting part 15. An oil control channel 2-6 is opened on the side wall of the valve body 2 between the valve seat 8 and the bracket 10, and an oil return channel 2-8 is opened on the outer wall of the valve body 2 between the bracket 10 and the armature 4. Both the plug cap 1 and the armature 4 are made of soft magnetic materials; the material of the valve body 2 is stainless steel;

[0036] The valve core 9 is an integrated structure composed of a spherical valve core 9-1 and a connecting rod 9-2. The connecting rod 9-2 is slidably arranged in the middle of the bracket 10. The free end of the connecting rod 9-2 is connected to the armature 4. The spherical valve core 9-1 is located at the oil control channel 2-8. Part of the spherical surface of the spherical valve core 9-1 is respectively matched with part of the spherical surfaces of the valve seat 8 and the bracket 10 to control the oil inlet and outlet.

[0037] The integrated high-speed on-off valve in this embodiment realizes the rapid movement of the valve core through a PWM signal. The valve has only two states: open and closed. Through high-speed switching, discrete flow rates are output at the valve port. Therefore, the size of the flow rate at the valve port is measured by the average flow rate. When the high-speed on-off valve works, these flow rates flow into the end of the main valve of the multi-way valve and push the main valve to move through hydraulic pressure. The high-speed on-off valve of the invention in this embodiment is a two-position three-way normally closed type and is integrally used in an inserted form.

[0038] As a possible implementation, the valve body 2 is an integrated structure. A fourth sealing groove 2-4, a third sealing groove 2-3, and a second sealing groove 2-2 are sequentially arranged on the outer wall of the valve body 2 in the direction from the oil inlet to the oil return for arranging a fourth sealing ring 7, a third sealing ring 6, and a second sealing ring 5 respectively. The third sealing ring 2-3 is located between the second sealing groove 2-2 and the fourth sealing groove 2-4. The third sealing groove 2-3 is located between the empty oil channel 2-6 and the oil return channel 2-8. The fourth sealing groove 2-4 is arranged at the end of the valve body 2 and is adjacent to the oil control channel 2-6.

[0039] The material of the valve body 2 is 9Cr18Mo stainless steel, which has high strength and hardness characteristics. The electromagnet and the valve parts are installed together in the structure of the valve body 2, with a simple structure. There is no need for the electromagnet to be thread - connected to the valve core and the valve body anymore; the valve seat 8 and the bracket 10 are respectively in interference fit with the inlet inner wall 2 - 5 and the middle inner wall 2 - 7 of the valve body 2; the valve uses a threaded plug - in structure. The outer diameters of the second sealing groove 2 - 2 and the third sealing groove 2 - 3 are the same, and the fourth sealing groove 2 - 4 is slightly smaller than the diameters of other grooves; external threads are machined at the outer convex wall 2 - 1 of the valve body 2 for threaded connection with the multi - way valve body; internal threads 2 - 10 are machined on the inner wall of the end of the valve body 2, and the plug cap 1 is connected to the internal threads 2 - 10 on the inner wall of the end; a U - shaped groove 2 - 9 is machined on the inner wall of the valve body 2 for the installation of the electrical interface of the encapsulated insulator 13.

[0040] As Figure 4 shown, the material of the valve core 9 is 9Cr18Mo stainless steel, which has high strength and hardness characteristics. The valve core 9 - 1 is an integrated structure of the valve core connecting rod. Compared with other valves of the same type, the steel ball and the connecting rod of this valve core are integrally processed, eliminating the threaded connection. External threads are machined on the connecting rod 9 - 2 for connecting the armature 4.

[0041] Furthermore, as Figures 5 - 7 shown, the plug cap 1 includes a plug plate 1 - 1 and a support body 1 - 2; the plug plate 1 - 1 is fixed on the support body 1 - 2. The support body 1 - 2 is a hollow cylinder. External threads are machined on the outer wall of the plug plate 1 - 1, and internal threads are machined on the inner wall of the hollow cylinder. The adjusting part 15 is a cylinder with external threads 15 - 1. The external threads of the plug plate 1 - 1 are connected to the internal threads of the inner channel of the valve body 2, and the internal threads of the hollow cylinder are thread - connected to the external threads 15 - 1 of the adjusting part 15.

[0042] Preferably, the material of the plug cap 1 is DT4C pure iron; external threads are machined at the plug plate 1 - 1 for connection and cooperation with the internal threads 2 - 10 of the inner channel of the valve body 2. The outer end circular part 1 - 3 of the plug cap 1 is flat - cut so that the plug cap 1 can be screwed into the valve body 2. The spring 11 is installed in the cylindrical holes of the plug cap 1 and the armature 4 to provide spring pre - tension. Axial positioning and adjustment of the spring pre - tension are achieved through the adjusting part 15, enabling the high - speed switching valve to meet different valve port pressure conditions.

[0043] As another implementable way, as Figure 8 and Figure 9As shown, the bracket 10 and the valve seat 8 are in interference fit with the inner wall of the valve body 2 respectively. The armature 4 has a connecting hole 4-1 and a groove 4-2. The connecting hole 4-1 is in threaded connection with the connecting rod of the valve stem 9, and the bottom of the groove 4-2 abuts against the end of the spring 11. Through the action of the spring 11, the opening and closing of the oil inlet by the valve core 9 is realized, so as to achieve the purpose of controlling the oil inlet and outlet. Preferably, the material of the armature 4 is DT4C pure iron. The armature 4 is processed with an internal thread to cooperate with the valve core connecting rod; the armature 4 is processed with a cylindrical groove for cooperating with the spring.

[0044] Optionally, as Figure 10 shown, the oil inlet channel of the valve seat 8 is a stepped hole, which is divided into a damping hole 8-1 and an oil inlet hole 8-4 that are in communication with each other. The outlet of the damping hole 8-1 is arranged towards the oil control channel 2-6. The outlet end face of the damping hole 8-1 is processed with a valve seat spherical surface 8-2 that can fit with the spherical valve core, and a step 8-3 is processed on the outer wall of the valve seat 8.

[0045] Optionally, the material of the valve seat 8 is 9Cr18Mo stainless steel, which has high strength and hardness characteristics. The damping hole 8-1 is a 2mm damping hole, which can effectively filter out the flow pulsation at the inlet, and at the same time reduce the static hydraulic pressure on the valve core when the valve port is closed, thereby reducing the design value of the spring pre-tightening force and improving the response speed of the valve core; the oil inlet hole 8-4 is processed with a valve seat spherical surface 8-2, which can fit with the spherical surface of the valve core; the valve seat 8 is processed with a step 8-3, which is convenient for positioning when cooperating with the valve body. The outer surface of the valve seat is in interference fit with the valve body. Optionally, the diameter of the processed oil inlet hole 8-2 is 5mm.

[0046] Furthermore, as Figures 11 - 12 shown, a cylindrical hole 10-2 is processed in the middle of the bracket 10. The end face of the cylindrical hole 10-2 is a spherical surface 10-1. A plurality of return grooves 10-3 are evenly distributed on the inner peripheral surface of the cylindrical hole 10-2. An oil outlet groove opening 10-5 is opened on the end face of the bracket 10 facing the oil return channel 2-8.

[0047] In this embodiment, preferably, the material of the bracket 10 is 9Cr18Mo high-hardness stainless steel. The bracket 10 is processed with a spherical surface 10-1 to fit with the spherical valve core; the cylindrical hole 10-2 is used to support the valve core 9; four return grooves 10-3 (such as rectangular) distributed in the cylindrical hole 10-2 can accelerate the return of the oil fluid, eliminate the oil fluid resistance generated by the small oil return space, and avoid the influence of the oil return fluid on the movement of the valve core; the outer surface 10-4 of the bracket 10 is in interference fit with the inner cavity of the valve body 2; the bracket 10 is processed with an oil outlet groove opening 10-5 (such as square). When the valve core 9 is reset, the oil fluid in the oil control channel 2-6 flows out to the oil cavity where the armature 4 is located through the spherical surface 10-1, the cylindrical hole 10-2 and the return grooves 10-3, and then flows out to the oil return channel 2-8 through the oil outlet groove opening 10-5.

[0048] Furthermore, as Figures 13 - 15As shown, a first sealing ring 3 is installed on the outer wall surface of the encapsulation insulator 13, and the encapsulation insulator 13 is sealed with the inner wall of the valve body 2 through the first sealing ring 3. At both ends of the coil insulating skeleton 14, stepped connecting arms extend radially. An inward groove 14-1 is machined at the corner of the stepped connecting arm. At both ends of the inner wall of the encapsulation insulator 13, docking arms and docking grooves extend radially. The docking arms are inserted into the grooves 14-1, and the stepped connecting arms are inserted into the docking grooves.

[0049] Preferably in this embodiment, the material of the encapsulation insulator 13 is PET, and insulation and corrosion resistance of the electromagnetic coil are achieved through encapsulation; a groove 13-3 is opened on the outer wall surface of the encapsulation insulator 13 to install the first sealing ring 3, which can effectively avoid oil leakage; the encapsulation shell 13-1 of the encapsulation insulator 13 is an electrical quick plug of the high-speed switching valve, facilitating electrical connection of the valve; the encapsulation head 13-2 is a hole-shaped socket used for the electrical plug, and there are two in total.

[0050] Preferably, the material of the coil insulating skeleton 14 is phenolic plastic, which is used for winding the coil 12 and has good high-temperature resistance and insulation performance. The groove 14-1 is machined on the coil insulating skeleton 14 to facilitate injection molding of the coil encapsulation insulator 13, improving the insulation and corrosion resistance of the electromagnetic coil.

[0051] Working principle: As Figures 1 - 2 , Figure 16 and Figure 17 shown, an oil inlet channel is provided at the valve seat 8 at the right end of the high-speed switching valve. The middle port of the valve body 2 is an oil control channel 2-6, and the left port of the valve body 2 is an oil return channel 2-8. When not energized, the oil control channel 2-6 communicates with the oil return channel 2-8, and the oil inlet channel is closed; when energized, the oil inlet channel communicates with the control channel 2-6, and the oil return channel 2-8 is closed. When the coil 12 is energized, the valve body 2, the plug cap 1, and the armature 4 are magnetized. Under the action of the electromagnetic force, the armature 4 overcomes the pre-tightening force of the spring 11 and drives the valve core 9 to move leftward together. At this time, the valve port opens, and the oil fluid flows from the oil inlet into the control channel 2-6. After power-off, the electromagnetic force fades, and the spring force resets the valve core 9, closing the valve port. The oil fluid in the oil control channel 2-6 flows into the oil return channel 2-8 through the oil port of the bracket 10.

[0052] The present invention has been disclosed above with preferred embodiments. However, it is not intended to limit the present invention. Any person skilled in the art, without departing from the technical solution scope of the present invention, can make some changes or modifications to the above-disclosed structure and technical content to form equivalent embodiments of equivalent changes, which still fall within the technical solution scope of the present invention.

Claims

1. An integrated high-speed on-off valve for the pilot of a multi-way valve, characterized in that: It includes a plug cap (1), a valve body (2), an armature (4), a valve seat (8), a valve core (9), a bracket (10), a spring (11), a packaging insulator (13), a coil insulating skeleton (14) and an adjusting part (15); The valve body (2) is a hollow body. The plug cap (1) and the valve seat (8) are respectively fixedly installed at both ends of the valve body (2). The valve seat (8) has an oil inlet passage. A bracket (10), an armature (4) and a packaging insulator (13) are sequentially inserted into the valve body (2) from the valve seat (8) towards the plug cap (1). The coil insulating skeleton (14) is installed in the inner cavity of the packaging insulator (13). The coil (12) is wound around the coil insulating skeleton (14). The plug cap (1) is inserted into the coil insulating skeleton (14) and is arranged adjacent to the slidable armature (4). An inner passage matching with the axially adjustable adjusting part (15) is processed in the middle of the plug cap (1). A spring (11) is arranged in the inner passage. The two ends of the spring (11) respectively abut against the armature (4) and the adjusting part (15). An oil control passage (2-6) is opened on the side wall of the valve body (2) between the valve seat (8) and the bracket (10). An oil return passage (2-8) is opened on the outer wall of the valve body (2) between the bracket (10) and the armature (4). Both the plug cap (1) and the armature (4) are made of soft magnetic materials, and the material of the valve body (2) is stainless steel; The valve core (9) is an integral structure composed of a ball head valve core (9-1) and a connecting rod (9-2). The connecting rod (9-2) is slidably arranged in the middle of the bracket (10). The free end of the connecting rod (9-2) is connected to the armature (4). The armature (4) has a connecting hole (4-1) and a groove (4-2). The connecting hole (4-1) is threadedly connected with the connecting rod (9-2) of the valve core (9). The bottom of the groove (4-2) abuts against the end of the spring (11). The ball head valve core (9-1) is located at the oil control passage (2-6). Part of the spherical surface of the ball head valve core (9-1) is respectively matched with part of the spherical surfaces of the valve seat (8) and the bracket (10) to control the oil inlet and outlet.

2. The integrated high-speed on-off valve for the pilot of the multi-way valve according to claim 1, characterized in that: The said valve body (2) is an integral structure. A fourth sealing ring (7), a third sealing ring (6) and a second sealing ring (5) are sequentially arranged on the outer wall of the valve body (2) from the oil inlet towards the oil return direction.

3. The integrated high-speed on-off valve for the pilot of the multi-way valve according to claim 1, characterized in that: The said plug cap (1) includes a plug board (1-1) and a support body (1-2); the plug board (1-1) is fixed on the support body (1-2). The support body (1-2) is a hollow cylinder. The outer wall of the plug board (1-1) is processed with an external thread, and the inner wall of the hollow cylinder is processed with an internal thread. The adjusting part (15) is a cylinder with an external thread (15-1). The external thread of the plug board (1-1) is connected with the internal thread of the inner passage of the valve body (2), and the internal thread of the hollow cylinder is threadedly connected with the external thread (15-1) of the adjusting part (15).

4. The integrated high-speed switching valve for the pilot of a multi-way valve according to claim 1, characterized in that: The bracket (10) and the valve seat (8) are respectively in interference fit with the inner wall of the valve body (2).

5. The integrated high-speed on-off valve for the pilot of the multi-way valve according to claim 1, characterized in that: The oil inlet passage of the valve seat (8) is a stepped hole, which is divided into a damping hole (8-1) and an oil inlet hole (8-4) that communicate with each other. The outlet of the damping hole (8-1) is arranged towards the oil control passage (2-6). The outlet end face of the damping hole (8-1) is machined with a valve seat spherical surface (8-2) that can fit with the ball head valve core. A step (8-3) is machined on the outer wall of the valve seat (8).

6. The integrated high-speed on-off valve for the pilot of the multi-way valve according to claim 1, characterized in that: A cylindrical hole (10-2) is machined in the middle of the bracket (10). The end face of the cylindrical hole (10-2) is spherical. A plurality of return grooves (10-3) are evenly distributed on the inner peripheral surface of the cylindrical hole (10-2). An oil outlet groove opening (10-5) is formed on the end face of the bracket (10) facing the oil return passage (2-8).

7. The integrated high-speed on-off valve for the pilot of the multi-way valve according to claim 1, characterized in that: A first sealing ring (3) is installed on the outer wall surface of the encapsulation insulator (13). The encapsulation insulator (13) is sealed with the inner wall of the valve body (2) through the first sealing ring (3).

8. The integrated high-speed on-off valve for the pilot of the multi-way valve according to claim 1 or 7, characterized in that: At both ends of the coil insulating skeleton (14), stepped connecting arms extend radially. An inward groove (14-1) is machined at the corner of the stepped connecting arm. At both ends of the inner wall of the encapsulation insulator (13), docking arms and docking grooves extend radially. The docking arms are inserted into the grooves (14-1), and the stepped connecting arms are inserted into the docking grooves.

9. The integrated high-speed switching valve for the pilot of a multi-way valve according to claim 1, wherein: The plug cap (1) and the armature (4) are both made of DT4C pure iron. The valve body (2), valve seat (8), valve core (9) and bracket (10) are all made of 9Cr18Mo stainless steel. The encapsulation insulator (13) is made of PET, and the coil insulating skeleton (14) is made of phenolic plastic.

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